2022-03-22 Meeting Meeting Notes
Date
Mar 22, 2022
Participants
@Jonathan Cameron
@Lorenzo Pieralisi (Deactivated)
Ilkka Koskinen <ilkka@os.amperecomputing.com>
@Joyce Qi
Goals
Welcome Edg and Ikka from Amperecomputing to join the discussion for more discussion.
Two main topics discussed:
vCPU Hotplug Update
Current status
ACPI spec change via code first route approved.
Kernel patches being reworked / rebased by ARM. Expected to be sent
out in 5.19 cycle.
QEMU patches being updated by Huawei. Will do at least some light testing
and then push out a public git tree so that others can test - will aim
to do this so it aligns with kernel code availability.Ed (Ampere) gave an update to say they are interested in pushing this
forwards ASAP and have customer / OS vendor engagement which will be
very useful in moving towards a complete solution, particularly ensuring
good test coverage etc.Noted that current QEMU patches may not cover all corner cases, for example
live migration of VMs that have vCPUs hotplugged. Might 'just work'
but we haven't tested it yet so probably not.Given we didn't really add anything on DOE / SPDM over previous calls,
I don't plan to send out anything on that topic this time.IORT RMR
discussion:Patchset requiring a final review from ARM (upcoming) but should
be ready to be merged
Handling of IO port access at 0x0 on !x86 to be fixed (caused by UEFI
allocating addresses starting at 0x0 for BARs and IORT RMR requiring
the OS to preserve the BAR value) in Linux but it does not affect the
upstreaming of patches (since the only platform where the issue
triggers does not have upstream IORT RMR tables)ACPICA pull request still not merged but on its way
Targeting v5.19 kernel (probably via ACPI tree to avoid Linux ACPICA
dependencies)
Repost of final version at v5.18-rc1
Recordings link:
Discussion topics
Time | Item | Presenter | Notes |
|---|---|---|---|
|
|
| |
Action items
Next time the meeting may be adjusted if US friends will join.